Global Patent Index - EP 2357344 B1

EP 2357344 B1 20130619 - Air/Fuel ratio control apparatus for general-purpose engine

Title (en)

Air/Fuel ratio control apparatus for general-purpose engine

Title (de)

Vorrichtung zur Steuerung des Luft/Kraftstoff-Verhältnisses für einen Motor

Title (fr)

Appareil de contrôle de rapport air-combustible pour moteur à combustion interne

Publication

EP 2357344 B1 20130619 (EN)

Application

EP 11151090 A 20110117

Priority

JP 2010029032 A 20100212

Abstract (en)

[origin: EP2357344A1] In an apparatus for controlling an air/fuel ratio of a general-purpose internal combustion engine using mixed fuel containing alcohol and gasoline and operated at a desired engine speed inputted by the operator while a throttle opening is regulated such that a detected engine speed converges to the inputted desired engine speed, a fuel injection amount prepared for mixed fuel is increased/decreased when a load is kept constant and the output air/fuel ratio (at which an output of the engine becomes maximum) is estimated. A rate of alcohol contained in the fuel is estimated from the estimated air/fuel ratio (S300 - S308, S312, S316 - S320, S324, S326) and the fuel injection amount is corrected based on the estimated alcohol rate (S310, S314, S322, S328), thereby determining the fuel injection amount appropriately in accordance with the estimated alcohol rate.

IPC 8 full level

F02D 41/00 (2006.01); F02D 19/08 (2006.01); F02D 35/00 (2006.01); F02D 41/06 (2006.01)

CPC (source: EP US)

F02D 19/061 (2013.01 - EP US); F02D 19/0613 (2013.01 - EP US); F02D 19/084 (2013.01 - EP US); F02D 19/088 (2013.01 - EP US); F02D 31/002 (2013.01 - EP US); F02D 41/0025 (2013.01 - EP US); F02D 41/1458 (2013.01 - EP US); F02D 41/06 (2013.01 - EP US); F02D 2041/1409 (2013.01 - EP US); F02D 2200/0612 (2013.01 - EP US); Y02T 10/30 (2013.01 - EP US)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DOCDB simple family (publication)

EP 2357344 A1 20110817; EP 2357344 B1 20130619; BR PI1100818 A2 20120731; CN 102155308 A 20110817; CN 102155308 B 20130918; JP 2011163278 A 20110825; JP 5346838 B2 20131120; US 2011202258 A1 20110818; US 8649958 B2 20140211

DOCDB simple family (application)

EP 11151090 A 20110117; BR PI1100818 A 20110211; CN 201110021313 A 20110119; JP 2010029032 A 20100212; US 97875110 A 20101227